I tried to export a extremely complex model with this plugin and it failed.
The problem is that some errors that are invisible in Modo can be fatal if a stl-program tries to import it. ( the mistakes are : holes, 2 point polygons, triangles that are only hanging in the mesh with 2 instead of 3 points).

Only with specialised software I could fix the errrors.
It is possible that simpler objects be exported successfully.